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Observer-based leader-following tracking control under both fixed and switching topologies

Control Theory and Technology 2016年第1期14卷 28-38页

作者： Jinhuan WANG pengxiao zhang Zhixin LIU Xiaoming HU School of Sciences Hebei University of Technology Tianfin 300130 China .Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China Optimization and Systems Theory and ACCESS Linnaeus Center Royal Institute of Technology Stockholm 100 44 Sweden

This paper studies the tracking problem for a class of leader-follower multi-agent systems moving on the plane using observer- based cooperative control strategies. In our set-up, only a subset of the followers can obtain some relative information on the leader. We assume that the control input of the leader is not known to any of the followers while the system matrix is broadcast to all the followers. To track such a leader, an observer-based decentralized feedback controller is designed for each follower and detailed analysis for the convergence is presented for both fixed and switching interaction topologies between agents with the method of common Lyapunov function. We can also generalize the result to the higher dimension case for fixed topology and some special system matrices of the leader for switching topology.

关键词： Multi-agent systems leader-following decentralized control observer

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Endurance time history analysis of the seismic behavior and performance assessment of hydro-chemo-mechanical degradation-affected hydraulic tunnels with service time

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Underground Space 2024年第4期17卷 207-225页

作者： Benbo Sun pengxiao Wang Gangqin zhang Mingjiang Deng Weiying Liu Jia Xu School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China Xinjiang Ertix River Basin Development and Construction Management Bureau Urumqi 830000China

Subjected to the coupling action of multiple hazards in hydraulic engineering,hydraulic tunnels may be corroded and damaged to varying degrees during their service lives,which will decrease the seismic performance of these ***,the research and seismic design of significant hydraulic engineering projects focus on investigating the structural response based on the design material parameters,which may overestimate the seismic capacity of structures during their service *** this paper,research is performed to identify the effect of hydro-chemo-mechanical corrosion on the seismic performance of hydraulic tunnels with different burial depths.A plastic damage model of time-varying concrete degradation induced by the hydro-chemo-mechanical effect is first determined and implemented,and the endurance time acceleration records are generated in ***,a study of the endurance time relationship of hydro-chemomechanical corrosion-affected hydraulic tunnels,considering the fluid–structure-surrounding rock interaction systems throughout the service period,is undertaken to directly associate the structural response with the predefined evaluation ***,this research constructs 3D time-varying fragility surfaces considering the hydro-chemo-mechanical effect and seismic *** results show that the relative displacement of hydro-chemo-mechanical corrosion-affected hydraulic tunnels is larger than that of nonaffected hydraulic ***-chemo-mechanical effect-induced material deterioration will lead to an increase in the cumulative damage(crack)area and damage degree of hydraulic ***,the seismic fragility analysis shows that the longer the service time of hydro-chemo-mechanical corrosion-affected hydraulic tunnels,the more likely they are to ***,attention should be given to improving the aseismic capacity of hydro-chemo-mechanical corrosion-affected hydraulic tunnels in future seismic design and performance asses

关键词： Hydro-chemo-mechanical effect Time-varying Hydraulic tunnels Fragility surface

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Three-Dimensional Density Distribution and Seismic Activity along the Guxiang–Tongmai Segment of the Jiali Fault,Tibet

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 454-467页

作者： FAN pengxiao YU Changqing WANG Ruixue ZENG Xiangzhi QU Chen zhang Yue Institute of Land and Resources Engineering Kunming University of Science and Technology Kunming 650000China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Jiangsu Donghai Continental Deep Hole Crustal Activity National Observation and Research StationLianyungangJiangsu 222000China

The Guxiang-Tongmai segment of the Jiali fault is situated northeast of the Namche Barwa Syntaxis in northeastern *** is one of the most active strike-slip faults near the syntaxis and plays a pivotal role in the examination of seismic activity within the eastern Himalayan *** study in the research region has yielded a 1:200000 gravity dataset covering an area 1500 km^(2).Using wavelet transform multiscale decomposition,scratch analysis techniques,and 3D gravity inversion methods,gravity anomalies,fault distributions,and density structures were determined across various *** the integration of our new gravity data with other geophysical and geological information,our findings demonstrate substantial variations in the overall crustal density within the region,with the fault distribution closely linked to these density *** in stratigraphic density are important causes of variations in the capacity of geological formations to endure regional tectonic *** are predominantly concentrated within the density transition zone and are primarily situated in regions of elevated *** hanging wall stress within the Guxiang-Tongmai segment of the Jiali fault exhibits a notable concentration,marked by pronounced anisotropy,and is positioned within the density differential zone,which is prone to earthquakes.

关键词： seismicity deep-density structure wavelet transform multi-scale decomposition scratch analysis 3D gravity inversion Jiali fault Tibet

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国家和28省(区、市)医保药品目录复合药收载情况分析

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中国药房 2017年第28期28卷 3896-3900页

作者：张鹏霄梅丹中国医学科学院北京协和医学院/北京协和医院药剂科北京100730

目的:为复合药的遴选及管理提供参考。方法:对国家医保药品目录和各省(区、市)医保药品目录增补品种所收载的复合药的品种数和收录频次进行统计分析,采用Spearman检验法对品种数和当地经济发展水平进行相关性分析。结果:国家医保药品目... 详细信息

目的:为复合药的遴选及管理提供参考。方法:对国家医保药品目录和各省(区、市)医保药品目录增补品种所收载的复合药的品种数和收录频次进行统计分析,采用Spearman检验法对品种数和当地经济发展水平进行相关性分析。结果:国家医保药品目录共收载复合药126个品种,涵盖了19个药物类别;发布了乙类医保药品目录的28省(区、市)基本医保乙类药品增补品种目录中,复合药增补品种从19种到50种不等,发布了复合药增补品种或异名库的24省(区、市)复合药增补品种从12种到117种不等;接近50%的药品仅被单个省(区、市)收载,绝大部分复合药纳入各省(区、市)为1~4频次。增补的复合药品种数同本省(区、市)人均国内生产总值(GDP)水平无关(P>0.05,r=-0.180)。结论:各地区复合药增补品种数与当地经济发展水平关系不大;复合药收载工作进度不一、数量差异较大且分散度高。建议在国家层面明确复合药概念,制定统一管理政策,规范复合药的遴选标准,保障患者的临床用药需求。

关键词：复合药国家医保药品目录省级医保药品目录收载

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黑色素瘤免疫治疗作用机制研究进展

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生物技术进展 2023年第6期13卷 900-906页

作者：张鹏晓胡念上海理工大学健康科学与工程学院上海200093 上海健康医学院附属第六人民医院南院上海201499

皮肤癌是临床中皮肤科常见的恶性肿瘤,以皮肤恶性黑色素瘤(cutaneous malignant melanoma,CM)侵袭性最强。随着人们生活习惯的改变,黑色素瘤的发病率逐渐升高,其发病主要与紫外线辐射引起黑色素细胞突变有关,具有极强的免疫原性,研究CM... 详细信息

皮肤癌是临床中皮肤科常见的恶性肿瘤,以皮肤恶性黑色素瘤(cutaneous malignant melanoma,CM)侵袭性最强。随着人们生活习惯的改变,黑色素瘤的发病率逐渐升高,其发病主要与紫外线辐射引起黑色素细胞突变有关,具有极强的免疫原性,研究CM的发生发展机制对于疾病的治疗至关重要。对皮肤恶性黑色素瘤的免疫治疗及其相关作用机制的研究进行了综述,以期为黑色素瘤的治疗提供新的思路。

关键词：黑色素瘤靶向治疗免疫检查点抑制剂肿瘤微环境

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农业绿色发展能力评价研究

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热带农业工程 2022年第4期46卷 22-27页

作者：张鹏霄张文政甘肃农业大学管理学院甘肃兰州730000

为了解甘肃省农业绿色发展能力,提升甘肃省农业发展质量,从资源利用、环境保护、高效利用、绿色发展4个维度构建甘肃省农业绿色发展能力评价指标体系。基于甘肃省2015~2019年农业绿色发展相关数据,采用熵权TOPSIS法对甘肃省农业绿色发... 详细信息

为了解甘肃省农业绿色发展能力,提升甘肃省农业发展质量,从资源利用、环境保护、高效利用、绿色发展4个维度构建甘肃省农业绿色发展能力评价指标体系。基于甘肃省2015~2019年农业绿色发展相关数据,采用熵权TOPSIS法对甘肃省农业绿色发展能力进行分析评价,结果表明,甘肃省农业绿色发展能力整体上呈上升趋势;资源利用、高效发展、绿色供给3方面均排第四,环境保护方面甘肃省排名第二,说明甘肃省农业绿色发展具有很大的空间,提高甘肃省农业绿色发展能力应注重加强农业现代化建设、因地制宜提升管理水平和农业生产者素质。

关键词：农业绿色发展能力评价

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